In situ high-resolution transmission electron microscopy synthesis observation of nanostructured carbon coated LiFePO4

Trudeau, Michel; Laul, Dharminder; Veillette, R.; Serventi, A. M.; Mauger, A.; Julien, C.; Zaghib, Karim

doi:10.1016/j.jpowsour.2011.04.003

Cited by 58 publications

(48 citation statements)

References 25 publications

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“…[68] is ill-crystallized. In the case of LiFePO 4 , for instance, we have determined that the amorphization of the surface layer also favors the solid-solution process, the two-phase behavior being recovered by heat treatment at circa 650 °C, accompanied with the re-crystallization of the surface layer during the carbon coating [70][71][72].…”

Section: Discussionmentioning

confidence: 99%

Anatase TiO2 nanoparticles for lithium-ion batteries

El-Deen

Hashem

Abdel-Ghany

et al. 2018

Ionics

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120

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International audienceAnatase TiO2 nanoparticles were prepared by a simple sol-gel method at moderate temperature. X-ray powder diffraction (XRD) and Raman spectroscopy revealed the exclusive presence of anatase TiO2 without impurities such as rutile or brookite TiO2. Thermogravimetric analysis confirmed the formation of TiO2 at about 400 °C. Particle size of about 20 nm observed by transmission electron microscopy matches well with the dimension of crystallites calculated from XRD. The electrochemical tests of the sol-gel-prepared anatase TiO2 show promising results as electrode for lithium-ion batteries with a stable specific capacity of 174 mAh g−1 after 30 cycles at C/10 rate. The results show that improvement of the electrochemical properties of TiO2 to reach the performance required for use as an electrode for lithium-ion batteries requires not only nanosized porous particles but also a morphology that prevents the self-aggregation of the particles during cycling

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Section: Discussionmentioning

confidence: 99%

Anatase TiO2 nanoparticles for lithium-ion batteries

El-Deen

Hashem

Abdel-Ghany

et al. 2018

Ionics

Self Cite

120

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“…Fortunately, iron combines easily with carbon, so that different sources of carbon can be used and have been tested [16,17]. Our experience is that lactose is a good precursor [18], although other choices are possible. The Figure 2 shows the resistivity curve of LiFePO 4 particles before and after carbon coating.…”

Section: Introductionmentioning

confidence: 99%

Overview of olivines in lithium batteries for green transportation and energy storage

Zaghib

Mauger

Julien

2012

J Solid State Electrochem

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We present the progress on the physical chemistry of the olivine compounds since the pioneering work of Prof. John Goodenough. This progress has allowed LiFePO 4 to become the active cathode element of a new generation of Li-ion batteries that makes a breakthrough in the technology of the energy storage and electric transportation. This achievement is the fruit of about a decade of intensive research in the electrochemical community during which chemists, electrochemists, and physicists added there efforts to understand the properties of the material, to overcome the obstacles that were met on the way, and finally to reach the state of the art that allows its commercial use for worldwide applications in the industry today. These obstacles involved carbon coating, purification, control of the surface, the progressive decrease of the size of the particles down to nanoscale, and comprehensive investigation of surface effects. Nevertheless, heterogeneity in the quality of the product available on the market is damaging and may even be an obstacle to the development of new demanding technologies such as electric transportation. Emphasis is placed on the quality control that is needed to guarantee the reliability and the optimum electrochemical performance of this material as the active cathode element of Li-ion batteries. The route to increase the performance of Li-ion batteries with the other members of the family is also discussed. Since Prof. John Goodenough not only initiated the work but also played a major role in the research and development on these materials through the years, the present review is dedicated to him.

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“…The strain at the interface between the two materials is accommodated by extended defects such as dislocations and grain boundaries; on the other hand, the LFP layer is well crystallized as evidenced by the lattice fringes in the HRTEM image (Figure 2c). This result suggests that LFP is deposited by some epitaxial effect on the well-crystallized surface of LMP, since the free surface of LFP at 600 °C is disordered [18]. The electrochemical features of the LMP-LFP (66:33) blend is illustrated in Figure 3, showing the charge-discharge profiles vs. specific capacity of the Li//blend coin cell for the first two cycles.…”

Section: Limnpo4-lifepo4 (Lmp-lfp) Blended Electrodementioning

confidence: 98%

Olivine-Based Blended Compounds as Positive Electrodes for Lithium Batteries

et al. 2016

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Blended cathode materials made by mixing LiFePO 4 (LFP) with LiMnPO 4 (LMP) or LiNi 1/3 Mn 1/3 Co 1/3 O 2 (NMC) that exhibit either high specific energy and high rate capability were investigated. The layered blend LMP-LFP and the physically mixed blend NMC-LFP are evaluated in terms of particle morphology and electrochemical performance. Results indicate that the LMP-LFP (66:33) blend has a better discharge rate than the LiMn 1´y Fe y PO 4 with the same composition (y = 0.33), and NMC-LFP (70:30) delivers a remarkable stable capacity over 125 cycles. Finally, in situ voltage measurement methods were applied for the evaluation of the phase evolution of blended cathodes and gradual changes in cell behavior upon cycling. We also discuss through these examples the promising development of blends as future electrodes for new generations of Li-ion batteries.

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In situ high-resolution transmission electron microscopy synthesis observation of nanostructured carbon coated LiFePO4

Cited by 58 publications

References 25 publications

Anatase TiO2 nanoparticles for lithium-ion batteries

Anatase TiO2 nanoparticles for lithium-ion batteries

Overview of olivines in lithium batteries for green transportation and energy storage

Olivine-Based Blended Compounds as Positive Electrodes for Lithium Batteries

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